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-rw-r--r--ext/tarkin/wavelet.c121
1 files changed, 121 insertions, 0 deletions
diff --git a/ext/tarkin/wavelet.c b/ext/tarkin/wavelet.c
new file mode 100644
index 00000000..a83aa499
--- /dev/null
+++ b/ext/tarkin/wavelet.c
@@ -0,0 +1,121 @@
+#include "mem.h"
+#include "wavelet.h"
+
+/**
+ * (The transform code is in wavelet_xform.c)
+ */
+
+
+#define MAX(a,b) ((a) > (b) ? (a) : (b))
+#define MAX3(a,b,c) (MAX(a,MAX(b,c)))
+
+
+
+Wavelet3DBuf* wavelet_3d_buf_new (uint32_t width, uint32_t height,
+ uint32_t frames)
+{
+ Wavelet3DBuf* buf = (Wavelet3DBuf*) MALLOC (sizeof (Wavelet3DBuf));
+ uint32_t _w = width;
+ uint32_t _h = height;
+ uint32_t _f = frames;
+ int level;
+
+ if (!buf)
+ return NULL;
+
+ buf->data = (TYPE*) MALLOC (width * height * frames * sizeof (TYPE));
+
+ if (!buf->data) {
+ wavelet_3d_buf_destroy (buf);
+ return NULL;
+ }
+
+ buf->width = width;
+ buf->height = height;
+ buf->frames = frames;
+ buf->scales = 1;
+
+ while (_w > 1 || _h > 1 || _f > 1) {
+ buf->scales++;
+ _w = (_w+1)/2;
+ _h = (_h+1)/2;
+ _f = (_f+1)/2;
+ }
+
+ buf->w = (uint32_t*) MALLOC (buf->scales * sizeof (uint32_t));
+ buf->h = (uint32_t*) MALLOC (buf->scales * sizeof (uint32_t));
+ buf->f = (uint32_t*) MALLOC (buf->scales * sizeof (uint32_t));
+ buf->offset = (uint32_t (*) [8]) MALLOC (8 * buf->scales * sizeof (uint32_t));
+
+ buf->scratchbuf = (TYPE*) MALLOC (MAX3(width, height, frames) * sizeof (TYPE));
+
+ if (!buf->w || !buf->h || !buf->f || !buf->offset || !buf->scratchbuf) {
+ wavelet_3d_buf_destroy (buf);
+ return NULL;
+ }
+
+ buf->w [buf->scales-1] = width;
+ buf->h [buf->scales-1] = height;
+ buf->f [buf->scales-1] = frames;
+
+ for (level=buf->scales-2; level>=0; level--) {
+ buf->w [level] = (buf->w [level+1] + 1) / 2;
+ buf->h [level] = (buf->h [level+1] + 1) / 2;
+ buf->f [level] = (buf->f [level+1] + 1) / 2;
+ buf->offset[level][0] = 0;
+ buf->offset[level][1] = buf->w [level];
+ buf->offset[level][2] = buf->h [level] * width;
+ buf->offset[level][3] = buf->f [level] * width * height;
+ buf->offset[level][4] = buf->offset [level][2] + buf->w [level];
+ buf->offset[level][5] = buf->offset [level][3] + buf->w [level];
+ buf->offset[level][6] = buf->offset [level][3] + buf->offset [level][2];
+ buf->offset[level][7] = buf->offset [level][6] + buf->w [level];
+ }
+
+ return buf;
+}
+
+
+void wavelet_3d_buf_destroy (Wavelet3DBuf* buf)
+{
+ if (buf) {
+ if (buf->data)
+ FREE (buf->data);
+ if (buf->w)
+ FREE (buf->w);
+ if (buf->h)
+ FREE (buf->h);
+ if (buf->f)
+ FREE (buf->f);
+ if (buf->offset)
+ FREE (buf->offset);
+ if (buf->scratchbuf)
+ FREE (buf->scratchbuf);
+ FREE (buf);
+ }
+}
+
+
+#if defined(DBG_XFORM)
+
+#include "pnm.h"
+
+void wavelet_3d_buf_dump (char *fmt,
+ uint32_t first_frame_in_buf,
+ uint32_t id,
+ Wavelet3DBuf* buf,
+ int16_t offset)
+{
+ char fname [256];
+ uint32_t f;
+
+ for (f=0; f<buf->frames; f++) {
+ snprintf (fname, 256, fmt, id, first_frame_in_buf + f);
+
+ write_pgm16 (fname, buf->data + f * buf->width * buf->height,
+ buf->width, buf->height, offset);
+ }
+}
+#endif
+
+